Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd913b090d68c64…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 03:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 71be279164c5e47bedd7951f415a57a3 SHA-1: d5450cc511b958c9b6d840bd233a5033bb6445cd SHA-256: 4cd913b090d68c64e6c809f3d7e5121b464a23056547e5474af0e1049f3d8230
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=pdf+save+as+text+blank PDF link annotation
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/ruroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fbaaacb361d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8c994444dbd.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/berulegegajevav_bizowiliponeni_nowonufa.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/zomuviwusu.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/duritanurufipiwut.pdfIn PDF document text
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/4957814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d017e34-0f18-4d9a-9441-1c8f126db27c/the_crooked_man_poem_conjuring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7037fd-b661-42b1-a300-9bced19f3970/14999880929.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/happy_ukulele_background_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6601772-bbad-4cbe-ab94-ccae6909cf75/labezirilaxosubediwifit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 5136 bytes
SHA-256: f8f08d8c7fe1dccdd47dc2620bf645ae6399862cd0013c22cf455e993946320e
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 11460 bytes
SHA-256: 266df101ddc08007984774a2de545611540d93a0e49b3e4b4736736ed0309c41

Open this report in the interactive analyzer, or submit your own file for analysis.